DIY PROMDo It Yourself PROM chip burning help. No PROM begging. No PROMs for sale. No commercial exchange. Not a referral service.
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I'm starting to wonder if a 96+ Vortec motor setup is the way to go with a SCPI. If the CPI portion could be made to control regular injectors you will have a sequential abd tranny control with a bolt on system. Only thing is you would have to get a OBDII system to tune.
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I've been running my Opti in my 94 for years.. no problem. What happens mostly on the LT1s is when the seals on the LT1 waterpumps start to fail it weeps coolant out of a hole in the pumps and drains onto the opti. This will find its way into the units and corrode it. You can easily harden the optis yourself by seeling them with RTV .. mainly on the opti plug itself. There's nothing to say you could just use the optispark for the pickup and a normal HEI for your HV distributor.. or use the optispark in full. I'm not sure about waterpump clearance.. that is a good question.. the next few days I should be able to mock up my old 94 opti on a gen 1 block to see.. I've always wanted to try this.. I can't believe no one else has yet.. 94-95 LT1 OBD1 pcm has all of the bells and whistles everyone is looking for along with convenience of flash programming!
I've got the Dist hogged out waiting on some bushings to get here so I can set the Shaft end play as well as mount the Opti base. As soon as thats done, I'll visit the local machine shop and get a collar or three machined.
Still waiting for the bushings to get here! Some had mentioned about to possibility of using some sort of trip computor. Looking around I noticed that the 16181333 which is the Vette ver of the 8051 has the ability of using a trip computor. It uses two pins which connects to the Central Control Module. Any ideas or info on this?
there's no way the opti would fit under a gen1 waterpump unless you could space it out a half inch or so... I put an opti cover on my marine 350 just to take a look
Okay then.... are there any hacks of the LT1 code available?
Unsure of what you meant by hack. Jim Moats has some bins on his site. There are definition files also available for the LT1. The program ID is $EE and there are 2 PCM's that were used depending upon the application either the 16181333 or the 16188051. The 16181333 was for the Vette and included extra drivers for a Trip Computor and then there was the 16188051 for the F-Bodies. Jims software works with these PCM's as well as TunerCat. Both of these are OBDI, although rummor has it that TunerCat has a OBDII version not listed on thier Site. Most go with OBDI.
Note: After 4 weeks, I finally got my shaft bushings. What a mess!!! I'll be working on a Guide to show what I've done so far and how I've done it.
Yes, I found them somewhere out there. Off hand not sure where. I have most of the set. Not sure if I have everything you would need as I don't know enough about that sort of thing yet.
One more issue you may run in to using the LT1 ECM is the absence of an AE ve TPS and an AE vs MAP table. There must be some kind of AE hard coded into the fueling routine but so far AFIK no one has found tables. The LT1's get by with this running Mass Air. When I switched to Speed Density on my LT1 the AE seemed like more of an issue.
Thanks. I guess now I'm REALLY over my head, since it's the 8051... What's the difference with the E and T files? One engine, one transmission or something?
I'm still working on my SD tune on my LT1 and now that the VE table is closer it seems that the AE stuff is less of an issue. Seems to be running pretty good on SD. I'm heading to the track this coming weekend so we'll see if ditching the MAF eliminates a bit of an intake tract restriction and picks me up a few ponies.
I may try to use PaperPort on them tonight. I've always had good luck when croping scans with PaperPort. I had tried to use PhotoShop but it wouldn't let me crop it right.
Checking out my old PC I found all the files mentioned in the 8051dis_Notes.txt from above. It also included several files from the same site that no longer exsist. They mainly deal with 8051 disassembly
My LT1 SD tune is working very good now. I've been using Joe Georgers VE master program and the results have been surprisingly good. After about 4 logs and VE master corrections my block learns are looking much better. The LT1's with decent cams always seem to have a good bit of split from left to right. The split is probably a function of the intake design as much as anything else. VE master has made my VE table look a little wonky but the BLM's don't lie. Normaly I would smooth the VE table but I'm thinking a cammed LT1 has some substantial transitions of VE from one gridpoint to the next. I think you guys will be happy with this swap when you get'er done. I have no AE issues as well. Thanks Joe for the nifty piece of software!
Question for anyone who has opened a 2240 or Northstar PCM...
Does the 2240 or the Northstar PCM have an unpopulated space on the PCB for a IAC driver. Like for example in the 730 there is an extra unused solder pad space for a second injector driver but GM only used this space to put a second driver for the 749.
Hate to bump this back up... but...
Has ANYONE opened up a 2240? That would be really cool if it was just a P4 with an extra daughterboard or something... I'm thinking about picking one up on ebay to disassemble if nobody here speaks up...
Yes. It is a P4 with an extra daughterboard . No stock unpopulated place for an IAC driver. There may be a way to replace the H bridge driver with an IAC driver.
I guess my question is how similar is it to the 7730/49? Would it have a snowball's chance of loading $8D and working? I think I'm going to have to pick it up now, just to see...
The caddy code is convoluted, so I don't think it's worth the effort to try to decode it... It would be neat if some other P4 code could be directly ported to it... maybe change a few pins around or addresses, or what have you... Then you'd have a "super duper 7730"... Presumably more ram, supports SEFI, double(?) the ROM space... Experimenter/coders' best friend.
Well we know they have the same style connectors, so I decided to check to see what might line up... The 2240 has a lot more i/o, so I just took the 7730 pins as a reference. The digital I/O lines up, as do most of the sensors.
Code:
7730 / 2240
A4 - +5 ref / N/C
5 - +5 ref / Sensor gnd
6 - IGN / IGN
8 - Serial data / Serial data(?)
11 - FP relay sig / Cool fan relay
12 - ECM gnd / ECM gnd
B1 - Battery / Battery
5 - sens gnd
6 - sens gnd / Front o2 sens Lo
9 - VSS lo / VSS lo
10 - VSS high / VSS hi
11 - 4000ppm / "speed output"
C7 - Bypass / Bypass
8 - EST / EST
9 - AC on req / PS press sw in
11 - odd INJ / INJ #1
12 - even INJ / INJ #8
16 - battery / battery
D1 - ECM gnd / GND
6 - inj gnd / GND
7 - inj gnd / GND
8 - REF / REF
9 - REF lo / REF lo(gnd)
12 - fan 2 req / fast idle in
14 - 4th gear sw / INJ #7
16 - p/n sw / INJ #3
E1 - N/C / ISM
2 - N/C / ISM
3 - IAC
4 - IAC / Shift sol B
5 - IAC
6 - IAC
7 - SES / canister purge
8 - Fan
9 - EGR
10 - N/C / Shift Sol A
13 - FP sig / FP feedback (?)
14 - O2 sig / Rear o2 sig
15 - o2 gnd / Rear o2 gnd
16 - CTS sig / CTS sig
F1 - Shift light / FP sig
2 - Port sol / Vent valve ctrl
4 - Conv sol / AC comp ctrl
9 - ESC knock
10 - Passkey / Passkey
13 - TPS sig / TPS sig
15 - MAP sig / MAP sig
16 - MAT sig / MAT sig
Okay, my ECM finally came in. Looks interesting. The '2240 has a row of 7 transistors, presumably for the injectors. The 8th injector must be controlled by a quad driver or something.
It definately is a P4 ECM, what's interesting is it only has one CPU. I was expecting two with all the things it has to control...
The 28763, if it is the ISM driver as mentioned earlier, does have 9 pins, and appears physically compatible for the IAC driver we're familiar with.
Unfortunately, my ECM didn't come with a memcal, so I can't compare those. I'd guess it looks like the 7730 minus the knock sensor board. Whether it is pin-pin compatible, and whether a knock sensor board can be added is yet to be determined. What's nice is almost all of the ICs on the board are familiar, just in different locations.
A schematic would come in major handy here, but I'm not sure there is one... <sigh>
Ryan, dredging up an old thread here... do you still have the pictures available? 3 out of 4 say not found when I clicky the links. Doing anything with the 2240, or is it scrap heap material for you?
